Question

which statement describes down syndrome?
○ it is a chromosomal abnormality.
○ it causes individuals to be taller than average.
○ it can be passed to other siblings.
○ it is preventable by exercise and a healthy diet.

Explanation:

Down syndrome is caused by a chromosomal abnormality (trisomy 21, an extra copy of chromosome 21). The other options are incorrect: it does not cause tall stature (individuals with Down syndrome are typically shorter), it is not passed like a typical genetic trait to siblings in a contagious or heritable - in the way implied, and it's not preventable by exercise/diet as it's a chromosomal condition.

Answer:

A. It is a chromosomal abnormality.